(2+1)(2^2+1)(2^4+1)(2^8+1)(2^16+1)=1×(2+1)(2^2+1)(2^4+1)(2^8+1)(2^16+1)=(2-1)×(2+1)(2^2+1)(2^4+1)(2^8+1)(2^16+1)=(2^2-1)(2^2+1)(2^4+1)(2^8+1)(2^16+1)=(2^4-1)(2^4+1)(2^8+1)(2^16+1)=(2^8-1)(2^8+1)(2^16+1)=(2^16-1)(2^16+1)=2^32-1
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